are currently running down leads internationally and domestically and two sources said today is also tax day. we also confirmed there is no individual or individuals from the bay area currently being investigated for any connection to the boston bombing. and finally two sources say on attacks like this it is not uncommon to have what is called a spike in monitored chatter and communications. both sources said according to federal agents the federal agents did not see spike in chatter before today's bombing. >>> we have been in contact with senator dianne feinstein who chaired the senate intelligence committee. she told us she has been briefed on the situation and intelligence officials told her they have no advanced warnings and this has the hallmarks of terrorism. >>> law enforcement officials are on heightened alert. thousands of sports fans are on their way to oakland. nbc bay area's cheryl hurd joins us at the coliseum where at 35,000 fans will be greeted with heavy security in the next hour. >> reporter: two major sporting events here. one here at the oracle arena, the other here at